Transition to advanced mathematics (8th edition)
3.1
9. give the digraphs for these relations on the set { 1, 2, 3}
b) s = { (1, 3), (2, 1) }
d) s^-1, where s = { (1, 3), (2, 1) }
f) s (dot) s, where s = { (1, 3), (2, 1) }